Coffee-mill.



W. W. DRYDEN.

COFFEE MILL.

APPMCA UM;

Illill) SEPT, 15 190E Patented Feb. 23, 1909.

4 rranner.

UNITED STATES F hTENT l1 1* l 3112.

COFFEE-MILL.

To all whom it may concern:

Be it known that I, WILLIAM W. DRYDEN. a citizen of the United States, residing ntthe citv of Philadelphia, in the county of Philo- Speclfication of Letters Patent Application filed September 19. 1808 I'etented Feb. 23, 1909.

Serial No. 463,803

at one end bears against it coiled spring 10,

mounted in the sold sleeve.

dolphin, and State of Pennsylvania, have inl vented certain new and useful Im rovements in (oiiee-Mills. of which the fol owing is o specification.

My invention relates to means operating to automatically disengage the iinding mechanism of a coffee or similar mi l, when foreign matter, such as nails, sticks or the like contact with working feces of fixed and movable members of the said grinding-mechanism of the mill to interfere with uniform workings thereof.

The nature and scope of my said invention will he more fully understood from the following description taken in connection with the accompiinging drawings forming part hereof, in whi'c Figure l, is a vertical longitudinal sectional view of a power 0 erated coii'ee mill havin driven shaft, on means for automatic-all disengaging the grinding-mechanism of the mill when matter forei n to that to be ground contacts with the wor ing faces of the said mechanism, the said means embodying main features of my present invention. Fig. 2, is u \uiiicni settion-n Tim? on the line :2, of Fig. 1, showing the dot-ail nrran ement of said automatic means for the de ed urpose; and i i". 3, is a. detail View of a lociiing means for a nger of the said means for onto- The sleeve 9. is ofisct at I], and shouldered at l2. and formed into an extension 13, to form u hearing which is mounted in n removable casing The end of the hearing 13, is recessed to form a llnnged end 14, and around the ollset )ortion 15, of which are arranged hulls t6, held .to lace, hv means of urecessed gasket 17, as c early illustrated in l-ig. 1.

18, is ujam-nut arranged to engage tlullanged end of the bearing 13. to tighten said hearing and also the sleeve on the shaft H, under the tension of the spring l0.

l9 and 20. are oil distributing devices haw ingpipes l9 and 20", extending through the i casings 3 and 3", for keeping the sleeve 9,

, enter one of a series of openings intended to j be provided on the inner side of the head of matieall; disengaging the said grindingmechanism.

Referring to the drawings 3 and 3, representsectional casings housing working parts of an ordinary ower operated coffee n nll.

4, is the feed 0 per provided therein, with a slide a. The opper 4, iner es into a chamber 5, in which 15 placed grin ing means 6, preferably, consistin of two toothed disks b and c, fucin each 01; or as shown in Fig. 1. One of t c tooth disks 6, of the said grinding means is fixed to the casing 3, by means of bolts or other fastenin means while the other disk c, is detaehebliv mounted on a. rotary member of the mill. From the inclined and straight walls of the main grinding chamber 5, and extending downward is an outlet throat 7.

8. is a driven shaft adapted to be operated from an electric or other motor, not shown. 5-5 The shaft 8, is sphnod at 8, to a sleeve 9, and 1 to enable the nose of the recessed boss 1 to I the jam-nut 18.

'22, is a leaf spring secured to the rim e, of the outer sleeve 22, held in frictional contact with the sleeve 9, as illustrated in Fig. 2 This spring '22, at its free ortion is hem outward into a curved and ant arranged so as to he helrl more or less firmly. hv a set screw e, extending through the rim 6. The oii'scr portion of the sleeve 9, is formed into a comshape boss f having a. recess f, to cn nge o hell 9, to hold the some therein, sided y the extension of the free extremity of the spring 22 which tension is maintained by the position of the setscrew e, in contact with the be shifted hack and forth to receive and release the ball g, as required. By the contact of foreign matter between the fixed and movable toothed or ebrnding members I: and c of the grinding mechanism 6, of the mill. t e disk 0, is caused to run free with the driven shaft 8, splined to the sleeve 9, utter the hall g, has been cast onto the inwardly extended or k, by the s ring locking device 23, ho ding the said nger h, in an operative position, as shown in Figs. 2 and 3, by contacting with the outer end of the fin er beyond the rim e. At the some time t e up turned inner end of the said finger it, Will occupy such a position within the rim e, as

clear the said end of the linger carrying the i of the said grinding mechanism can be prcball 9, the sleeve 9, revolving said boss by served from the damn ing influences of formenns of the driven shaft 8, as will be un- 1 eign matter almost indefinitely, because inderstood from Figs. 1 and 2. The locking variably the grindings in such mills are condeviee 23, hearing with a spring like elfect l stantly subject to the effects of foreign matagainst the enlarged outer end of the finger h, ter, tending to destroy unduly the reliable coupled with the slit h, holds it frictionnlly workings of the mill. u must the respective walls thereof, as Having thus described the nature and obefiaarly illustrated in Fig. 2. The normal i ject of my invention, what 1 claim as new osition of the finger h; to receive the said j and desire to secure by Letters Patent is:--- liall g, from the recess f, of the boss f, is l. Inacofi'ee mill, means to automatically that shown in Fig. 2.

If foreign matter is carried into the grind- I prising a rotatable member carrying a rotary ing means with coffee or the like to be part of said grinding means, said member ground tendin to clog up or interfere with l provided with a recessed-end, a. ball adapted the normal woFking of the grinding means of to engage said recessed end, a spring for northe mill at once the undue friction brought mally holding said ball in the recessed end of to bear will cause the inner sleeve 9, to turn said rotatable member and means to receive to such an extent as to overcome the tension and hold Stl-lli ball when released from the of the spring 22, holding the ball g, in the recessed end of said rotatable member, subrecess f, of the boss f, and hence to cast it stantially as and for the purposes described. onto the finger h, when in the position as shown in Fig. 2. The driven shaft 8, splined to the sleeve 9, will by the foregoing action continue to revolve, but the disk 1:, of the grinding means will be rendered inoperative i with respect to the fixed disk I), of the said 1 means, in the casing 33. By stopping the mill and removim the detachable easing 3", i by means of the oak-nuts 3", as fully dlusi trat-edinFig. 2, and moving the spring finger against said ball in the recess of said boss h, outward, away from the engagement of i and a. shiftable means for receiving said ball 4 l l i l l l disengage grinding means of the mill, comprising a. rotatable member cnrryin a rotary part of said grinding means, suit member provided with a recessed boss, aflat s ring located in prosimit I to said boss, a bail held in the recess of sai boss under the influence of said spring, means for inereasi or decreasing the normal tension of so id spring the locking device 23, the ball will be rewhen released from the tension under which leased from its engagement with the said it is held by said spring in the recess of said finger h, and can then travel around so as to boss, substantially as and for the purposes take into the recessf, of the boss f, of the described. sleeve 9, under the tension of the leaf spring In witness whereof, I have hereunto set 9 hold it figain in a'position correspondl my signature in the presence of two subscribi with that ustrated in Fig. 2. 5 ing witnesses.

rmitting the grinding members b and lVlbLIAM W. DRYD .42 c. o t a said grinding e -h i 6 f th l mill to become inoperative as above exl plained, the teeth of the respective members i Witnwes:

J. WALTER DOUGLASS, THOMAS M. Sm'rn disengage grinding menus of the mill, com- 2. In a eol'fee Im'll, means to autmnaticnlly iii] 

